Alkylphenyl benzopyranopyridines

ABSTRACT

Alkylphenyl benzopyranopyridines represented by the formula ##STR1## where R 1  is hydrogen, loweralkyl, loweralkanoyl, cycloalkylloweralkyl, cycloalkylloweralkanoyl, loweralkenyl, loweralkynyl, haloloweralkenyl, phenylloweralkyl, phenylloweralkenyl or phenylloweralkynyl; R 2  is loweralkyl; R 3  is hydrogen; Y is a straight or branched chain alkylene group having from one to ten carbon atoms; and each R 4  and R 5  and R 6  are the same or different members of the group consisting of hydrogen, halo, trifluoromethyl or loweralkyl; and the pharmaceutically acceptable salts thereof.

REFERENCE TO RELATED APPLICATION

This application is a continuation-in-part of copending application filed Apr. 2, 1973, bearing Ser. No. 345,942, now abandoned.

DETAILED DESCRIPTION OF THE INVENTION

This invention relates to novel alkylphenyl benzopyranopyridines and to heterocyclic esters thereof, to methods of preparing the compounds, to pharmaceutical compositions containing the compounds and to use of the compounds and pharmaceutical compositions containing the compounds for pharmacological and medicinal purposes.

According to one aspect of this invention, compounds are provided which can be represented by the formula ##STR2## wherein R₁ is hydrogen, loweralkyl, loweralkanoyl, cycloalkylloweralkyl, cycloalkylloweralkanoyl, loweralkenyl, loweralkynyl, haloloweralkenyl, phenylloweralkyl, phenylloweralkenyl or phenylloweralkynyl; R₂ is loweralkyl; R₃ is hydrogen; Y is a straight or branched chain alkylene group having from one to ten carbon atoms; and each R₄ and R₅ and R₆ are the same or different members of the group consisting of hydrogen, halo, trifluoromethyl or loweralkyl; and the pharmaceutically acceptable salts thereof.

The term "loweralkyl" as used herein, refers to C₁ -C₆ straight or branched chain alkyl groups including methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, tert-butyl, n-pentyl, iso-pentyl, neo-pentyl, n-hexyl and the like.

The term "loweralkenyl" refers to straight and branched chain C₂ -C₆ alkyl radicals from which a hydrogen atom has been removed from each of two adjacent carbon atoms to produce ethylenic unsaturation; e.g., vinyl, allyl, methallyl, 1-pentenyl and the like.

The term "loweralkynyl" refers to C₂ -C₆ alkyl groups as defined above, from which two hydrogen atoms have been removed from each of two adjacent carbon atoms to produce acetylenic unsaturation; e.g., ethynyl, propargyl, 2-butynyl, 1-pentynyl and the like groups.

The term "halo" includes chloro, fluoro, bromo and iodo.

The term "loweralkanoyl" refers to saturated monovalent, aliphatic radicals derived from a monocarboxylic acid, including straight or branched chain radicals of from one to six carbon atoms including the formyl, acetyl, propionyl, α-methylpropionyl, butyryl, hexanoyl and the like radicals.

"Cycloalkyl," as used herein, refers to cyclic saturated aliphatic radicals having three to eight carbon atoms in a ring, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl and cyclooctyl.

"Cycloalkylloweralkyl" refers to groups such as cyclopropyl-methyl, 2-methylcyclobutyl and the like.

The term "pharmaceutically acceptable salts" refers to salts such as sodium, potassium, calcium, barium, aluminum, ammonium and substituted ammonium salts, such as methyl ammonium, benzyl ammonium, triethanol ammonium salts and the like. Such salts are well known in the art and are considered to be "pharmaceutically acceptable."

Generally speaking, the preferred compounds of this invention wherein R₃ is hydrogen can be prepared by the following routes: ##STR3##

The compounds of this invention are useful as analgesic agents at dosages of from 0.01 - 25.0 mg./kg. of body weight daily. The presently preferred compound, .[.5,5-dimethyl-8-(4-p-fluorophenyl-1-methylbutyl)-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.has an oral ED₅₀ of 5.3 mg./kg. in the mouse writhing test for analgesia, [Whittle, Brit. J. Pharmacol., 22, 296 (1964)], (codeine has an oral ED₅₀ of 15.6 mg./kg. in the mouse writhing test); an oral ED₅₀ of 3.7 mg./kg. in the rat tail flick test [Harris, et al. J. Pharm. Exp. Ther. 169 17 (1969)], and an oral ED₅₀ of 5.7 mg./kg. in the hot plate test.

In addition to their use as analgesic agents, the compounds are useful as mild tranquilizers at dosages of from 0.01 - 20 mg./kg. of body weight daily. Since many patients suffering from pain are anxious and apprehensive, the compounds of this invention are particularly useful as analgesic agents. The compounds further appear to produce analgesia and mild tranquilization without sedative or sedative-hypnotic effect, thus enabling the patients to carry out their normal activities while taking a compound of this invention.

In addition to their use as analgesics and tranquilizers, the compounds are also useful as anticonvulsants, antidiarrheals and antiulcer agents. They may be administered via oral, parenteral or intravenous administration.

The present invention includes within its scope pharmaceutical compositions comprising, as an active ingredient, at least one of the compounds of this invention in association with a pharmaceutically acceptable carrier or diluent. The compounds of this invention exhibit both oral and parenteral activity and can be formulated in dosage forms for oral, parenteral or rectal administration.

Solid dosage forms for oral administration include capsules, tablets, pills, powders and granules. In such solid dosage forms, the active compound is admixed with at least one inert diluent such as sucrose, lactose or starch. Such dosage forms can also comprise, as is normal practice, additional substances other than inert diluents, e.g., lubricating agents such as magnesium stearate and sweetening and flavoring agents. Tablets and pills can additionally be prepared with enteric coatings.

Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, solutions, suspensions, syrups and elixirs containing inert diluents commonly used in the art, such as water. Besides inert diluents, such compositions can also include adjuvants, such as wetting agents, emulsifying and suspending agents and sweetening, flavoring and perfuming agents.

Preparations according to this invention for parenteral administration include sterile aqueous or nonaqueous solutions, suspensions or emulsions. Examples of nonaqueous solvents or vehicles are propylene glycol, polyethylene glycol, vegetable oils, such as olive oil, and injectable organic esters such as ethyl oleate. Such dosage forms may also contain adjuvants such as preserving wetting, emulsifying and dispersing agents. They may be sterilized by, for example, filtration through a bacteria-retaining filter, by incorporating sterilizing agents into the compositions, by irradiating the compositions, or by heating the compositions. They can also be manufactured in the form of sterile solid compositions which can be dissolved in sterile water, or some other sterile injectable medium immediately before use.

Compositions for rectal administration are suppositories which may contain in addition to the active substance, excipients such as cocoa butter or a suppository wax.

The dosage of active ingredient in the compositions of this invention may be varied; however, it is necessary that the amount of the active ingredient shall be such that a suitable dosage form is obtained. The selected dosage depends upon the desired therapeutic effect, on the route of administration and on the duration of the treatment. Generally, dosage levels of between 0.01 - 25 mg./kg. of body weight daily are administered to patients in need of analgesia or tranquilization or for other needs stated above.

The following example further illustrates the pharmaceutical compositions which are a feature of this invention:

EXAMPLE 1

Tablets weighing 200 mg. and having the following composition are prepared by standard tableting procedures:

    ______________________________________                                         Ingredient             Mg.                                                     ______________________________________                                         .[.Preparation of 5,5-Dimethyl-8-(4-p-                                         fluorophenyl-1-methyl-butyl)-10-hydroxy -2-                                    (2-propynyl)-1,2,3,4-tetrahydro-5H[1]                                          benzopyranol [4,3-c]pyridine-10-ol.].                                          .Iadd.5,5-Dimethyl-8-[4-.Iaddend.                                              .Iadd.(p-fluorophenyl)-1-methylbutyl]-10-.Iaddend.                             .Iadd.hydroxy-2-(2-propynyl)-1,2,3,4-.Iaddend.                                 .Iadd.tetrahydro-5H[1]benzopyranol[4,.Iaddend.                                 .Iadd.3-c]pyridine.Iaddend.                                                                           100                                                     starch                 94                                                      colloidal silica       5                                                       magnesium stearate     1                                                       ______________________________________                                    

It will be understood by those skilled in the art that the above composition can contain any of the compounds of this invention.

The following examples further illustrate this invention without, however, limiting it thereto:

EXAMPLE 2 Preparation of 2-(3,5-Dimethoxyphenyl)-5-(p-Fluorophenyl)Pentane

A solution of 77 g. of 3-(p-fluorophenyl)propylbromide in 300 ml. of ether was added dropwise over a two-hour period to a refluxing solution of 10 g. of magnesium in 100 ml. of ether. The reaction mixture was refluxed for an additional 30 minutes after the addition was completed. A solution of 68 g. of 3,5-dimethoxyacetophenone in 100 ml. of ether was then added dropwise to the reaction and the mixture was refluxed for 11/2 hours. To the reaction was added 300 ml. of a saturated ammonium chloride solution dropwise with stirring. The layers were separated and the aqueous layer extracted with ether. The ether extract was dried over magnesium sulfate and the ether removed in vacuo to give an oil. An additional 111.7 g. of 3-(p-fluorophenyl)propylbromide was reacted with 3,5-dimethoxyacetophenone in the above manner. The products from both runs were hydrogenated in ethanol-HCl using palladium as the catalyst. The solvents and catalyst were removed and the crude material distilled to yield 169.0 g. of 2-(3,5-dimethoxyphenyl)-5-(p-fluorophenyl)pentane, b.p. 145 - 155/0.05 mmHg.

Analysis Calcd. for C₁₉ H₂₃ O₂ F: C, 75.60; H, 7.69 Found: C, 75.87; H, 7.98

EXAMPLE 3 Preparation of 2-(3,5-Dihydroxyphenyl)-5-(p-Fluorophenyl)Pentane

Fifty grams of the above-prepared 2-(3,5-dimethoxyphenyl)-5-(p-fluorophenyl)pentane, 450 ml. of acetic acid and 180 ml. of 48% HBr in water were mixed. While cooling, the mixture was saturated with hydrogen gas (approximately one-half hour). The reaction was placed in an 87° bath and stirred for 17 hours. The reaction was then concentrated in vacuo and the residue neutralized with K₂ CO₃ and NaHCO₃, extracted with ether, treated with charcoal and MgSO₄ and filtered to yield 45 g. of 2-(3,5-dihydroxyphenyl)-5-(p-fluorophenyl)pentane as a brown oil which distills at 180°/0.01 mmHg.

Analysis Calcd. for C₁₇ H₁₉ O₂ F: C, 74.20; H, 6.98 Found: C, 73.56; H, 7.04

EXAMPLE 4 Preparation of .[.2-Benzyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-10-Hydroxy-5-Oxo-1,2,3,4-Tetrahydro-5H-[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

To 45 g. of 2-(3,5-dihydroxyphenyl)-5-(4-fluorophenyl)pentane dissolved in 100 ml. of methanesulfonic acid were added in portions, 57 g. of 1-benzyl-3-keto-4-carbethoxy piperidine hydrochloride. While stirring, 68 g. of POCl₃ was added and the solution was stirred for 5 days at room temperature. Water (300 ml.) and 180 ml. of CHCl₃ were then added and the reaction mixture stirred for 30 minutes. After the addition of 100 ml. of 15% NaOH, the reaction was stirred for an additional 10 minutes. The CHCl₃ layer was separated and extracted with 10% HCl. The CHCl₃ layer was concentrated and CH₃ CN added thereto to yield 55 g. of the desired product as the hydrochloride salt, m.p. 254° - 256° C.

Theory: C, 70.80; H, 6.14; Cl, 6.97; N, 2.75 Found: C, 70.15; H, 6.17; Cl, 7.23; N, 2.74

EXAMPLE 5 Preparation of .[.2-Benzyl-5,5-Dimethyl-8-(4-Fluorophenyl-1-Methylbutyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3c]Pyridin-10-ol.]. .Iadd.2-Benzyl-5,5-dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

Sixty-five grams of the above-prepared .[.2-benzyl-8-(4-fluorophenyl-1-methylbutyl)-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H-[1]benzopyrano[4,3-c]pyridin-10-ol hydrochloride.]. .Iadd.2-benzyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.were suspended in 300 ml. of CHCl₃. After adding a KHCO₃ solution, the reaction was stirred for 30 minutes. The chloroform layer was separated, dried over MgSO₄, concentrated, taken up in benzene and concentrated again. The concentrate was taken up in 185 ml. of hot anisole and the resulting solution was added dropwise to a solution of CH₃ MgBr in anisole (prepared by adding 180 g. of CH₃ Br in 500 ml. of ether to 40 g. of Mg in 150 ml. of ether, evaporating the ether and adding 300 ml. of anisole). The reaction mixture was stored overnight at 62° C. Water (200 ml.) was added slowly, followed by 400 ml. of 10% H₂ SO₄. The anisole was removed by steam distillation and the resulting solid was taken up in chloroform, neutralized with KHCO₃, dried over MgSO₄ concentrated and the product (36.6 g.), m.p. 188° - 190° C., crystallized from CH₃ CN.

Analysis Calcd. for C₃₂ H₃₆ FNO₂ : C, 79.15; H, 7.47; N, 2.89 Found: C, 78.86; H, 7.67; N, 2.79

EXAMPLE 6 Preparation of .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

32.8 g. of the above-prepared .[.2-benzyl-5,5-dimethyl-8-(4-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.2-benzyl-5,5-dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.hydrochloride (m.p. 231 - 235, prepared by reacting the base of Example 5 with HCl in ethanol and crystallizing from ethyl acetate) was hydrogenated in ethanol. The catalyst was removed, the solution concentrated, and the desired product was crystallized from ethanol-Skelly B as 19.9 g. of amorphous solid, m.p. 222° - 225° C.

Theory: C, 69.50; H, 7.23; N, 3.24; Cl, 8.21 Found: C, 69.67; H, 7.34; N, 3.12; Cl, 8.10

EXAMPLE 7 Preparation of .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

.[.5,5-Dimethyl-3-(4-p-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.as the free base (19.9 g.) was dissolved in 88 ml. of dimethylformamide. While the solution was cooling, 3.14 g. of propargyl bromide was added. The reaction was stirred at room temperature for 15 hours. Water (120 ml.) was added slowly, whereupon the desired product crystallized. The crystalline product was washed with water and recrystallized from ether and CH₃ CN to yield 5.90 g. of the desired product, m.p. 164° - 166° C.

Analysis Calcd. for C₂₈ H₃₂ FNO₂ : C, 77.25; H, 7.46; N, 3.21 Found: C, 77.57; H, 7.76; N, 3.11

EXAMPLE 8 2-(3,5-Dimethoxyphenyl)-5-(4-Methylphenyl)Pentane

By the method described in Example 2, 3(.[.4-.].p-methylphenyl)propyl bromide was converted into the desired product b.p. 170 - 175/0.6mm.

Analysis Calcd. for C₂₀ H₂₆ O₂ : C, 80.49; H, 8.78 Found: C, 80.31; H, 9.14

EXAMPLE 9 .Badd..[.2-Benzyl-8-(4-p-Methylphenyl-1-Methylbutyl)-10-Hydroxy-5-Oxo-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]..Baddend. .Iadd.2-Benzyl-8-[4-(p-methylphenyl)-1-methylbutyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 8 was converted to the resorcinol by the method described in Example 3 and the resulting resorcinol converted to the desired compound by the method of Example 4. The product had m.p. 236° - 240° C.

Analysis Calcd. for C₃₁ H₃₄ ClNO₃ : C, 73.95; H, 6.81; N, 2.78 Found: C, 73.80; H, 6.81; N, 2.80

EXAMPLE 10 .[.2-Benzyl-5,5-Dimethyl-8-(4-p-Methylphenyl-1-Methylbutyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-5,5-dimethyl-8-[4-(p-methylphenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 9 was converted to the desired compound by the method of Example 5. The base was converted to the hydrochloride with HCl in ethanol. Product had m.p. 225° - 226° C.

Analysis Calcd. for C₃₃ H₄₀ ClNO₂ : C, 82.20; H, 8.16; N, 2.91 Found: C, 81.87; H, 8.44; N, 2.79

EXAMPLE 11 .[.5,5-Dimethyl-8-(4-p-Methylphenyl-1-Methylbutyl)-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-methylphenyl)-1-methylbutyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

The compound of Example 10 was hydrogenated as described in Example 6 and alkylated with propargyl bromide as described in Example 7. The desired product had m.p. 159° - 160° C.

Analysis Calcd. for C₂₉ H₃₅ NO₂ : C, 81.08; H, 8.21; N, 3.26 Found: C, 81.39; H, 8.47; N, 3.31

EXAMPLE 12 2(3,5-Dimethoxyphenyl-4-(4-Fluorophenyl)Butane

By the method described in Example 2, 2(.[.4-.]. p-fluorophenyl)ethyl bromide was converted to the desired compound b.p. 145 - 155/0.3.

Analysis Calcd. for C₁₈ H₂₁ FO₂ : C, 75.01; H, 7.34 Found: C, 75.09; H, 7.54

EXAMPLE 13 .[.2-Benzyl-8-(3-p-Fluorophenyl-1-Methylpropyl)-10-Hydroxy-5-Oxo-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-8-[3-(p-fluorophenyl)-1-methylpropyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride

The compound of Example 12 was converted into the resorcinol by the method of Example 3 and the resulting resorcinol converted into the desired compound by the method of Example 4. The product had m.p. 243° - 246° C.

Analysis Calcd. for C₂₉ H₂₉ ClFNO₃ : C, 70.91; H, 5.91; N, 2.83 Found: C, 71.14; H, 6.04 N, 2.77

EXAMPLE 14 .[.2-Benzyl-5,5-Dimethyl-8-(3-p-Fluorophenyl-1-Methylpropyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-5,5-dimethyl-8-[3-(p-fluorophenyl)-1-methylpropyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 13 was converted to the desired compound by the method of Example 5. The base was converted to the hydrochloride with HCl in ethanol. The product had m.p. 237° - 270° C.

Analysis Calcd. for C₃₁ H₃₅ ClFNO₂ : C, 78.80; H, 7.26; N, 2.97 Found: C, 78.45; H, 7.44; N, 2.78

EXAMPLE 15 .[.5,5-Dimethyl-8-(3-p-Fluorophenyl-1-Methylpropyl)-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[3-(p-fluorophenyl)-1-methylpropyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

The compound of Example 14 was hydrogenated as described in Example 6 and alkylated with propargyl bromide as described in Example 7. The desired product had m.p. 174° - 175° C.

Analysis Calcd. for C₂₇ H₃₀ FNO₂ : C, 77.25; H, 7.20; N, 3.33 Found: C, 77.30; H, 7.12; N, 3.17

EXAMPLE 16 2(3,5-Dimethoxyphenyl)-6-(4-Fluorophenyl)Hexane

By the method described in Example 2, 4-(4-fluorophenyl)butyl chloride was converted into the desired product b.p. 155 - 160/0.3mm.

Analysis Calcd. for C₂₀ H₂₅ FO₂ : C, 75.95; H, 7.96 Found: C, 76.24; H, 7.93

EXAMPLE 17 .[.2-Benzyl-8-(5-p-Fluorophenyl-1-Methylpentyl)-10-Hydroxy-5-Oxo-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-8-[5-(p-fluorophenyl)-1-Methylpentyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 16 was converted to the resorcinol by the method described in Example 3 and the resulting resorcinol converted to the desired product by the method of Example 4. The product had m.p. 227° - 228° C.

Analysis Calcd. for C₃₁ H₃₃ ClFNO₃ : C, 71.32; H, 6.37 N, 2.68 Found: C, 71.05 H, 6.38 N, 2.76

EXAMPLE 18 .[.2-Benzyl-5,5-Dimethyl-8-(5-p-Fluorophenyl-1-Methylpentyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-5,5-dimethyl-8-[5-(p-fluorophenyl)-1-methylpentyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 13 was converted to the desired compound by the method of Example 5. The base was converted to the hydrochloride with HCl in ethanol. The product had m.p. 208° - 210° C.

Analysis Calcd. for C₃₃ H₃₉ ClFNO₂ : C, 73.93; H, 7.33 N, 2.61 Found: C, 73.68 H, 7.48 N, 2.62

EXAMPLE 19 .[.5,5-Dimethyl-8-(5-p-Fluorophenyl-1-Methylpentyl)-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[5-(p-fluorophenyl)-1-methylpentyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

The compound of Example 18 was hydrogenated as described in Example 6 and alkylated with propargyl bromide as described in Example 7. The desired product had m.p. 146° - 147° C.

Analysis Calcd. for C₂₉ H₃₁ FNO₂ : C, 77.82; H, 7.65; N, 3.12 Found: C, 77.20; H, 7.59; N, 3.06

EXAMPLE 20 2(3,5-Dimethoxyphenyl)-3-Methyl-5-(p-Fluorophenyl)Pentane

3,5-Dimethoxy propiophenone (52.0 g.) was added to a suspension prepared from 13.9 g. 57% sodium hydride in mineral oil (which had been freed of mineral oil by washing with toluene) and 130 ml. toluene. The resulting mixture was refluxed 30 minutes, 51 g. of 2(p-fluorophenyl)ethyl bromide added and refluxed 2-Y₂. The mixture was worked up with water and HCl and the product distilled to give 66.4 g. 1-(3,5-dimethoxyphenyl)-2-methyl-4(p-fluorophenyl)-1-butanone b.p. 160 - 175/0.3mm. This ketone in 300 ml. ether was treated with 130 ml. of 3 molar methyl magnesium bromide in ether and worked up with ammonium chloride to give 71.0 g. 2(3,5-dimethoxyphenyl)-3-methyl-5(p-fluorophenyl)-2-pentanol. This alcohol was hydrogenated in acetic acid containing 2 ml. H₂ SO₄ using palladium catalyst to give 55.0 g. of desired compound b.p. 150 - 155/0.3mm. Gas chromatography showed 2 isomers of ratio 63/37.

Analysis Calcd. for C₂₀ H₂₅ FO₂ : C, 75.95; H, 7.96 Found: C, 76.04; H, 8.22

EXAMPLE 21 .[.2-Benzyl-8-(4-p-Fluorophenyl-1,2-Dimethylbutyl)-10-Hydroxy-5-Oxo-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-8-[4-(p-fluorophenyl)-1,2-dimethylbutyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 20 was converted to the resorcinol by the method described in Example 3 and the resulting resorcinol converted to the desired compound by the method of Example 4. The product had m.p. 252° - 258° C.

Analysis Calcd. for C₃₁ H₃₃ ClFNO₃ : C, 71.20 H, 6.47 N, 2.68 Found: C, 71.12 H, 6.56 N, 2.95

EXAMPLE 22 .[.2-Benzyl-5,5-Dimethyl-8-(4-p-Fluorophenyl-1,2-Dimethylbutyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-5,5-dimethyl-8-[4-(p-fluorophenyl)-1,2-dimethylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 21 was converted to the desired compound by the method of Example 5. The base had m.p. 201° - 204° C. The base was converted to the hydrochloride by HCl in ethanol. The hydrochloride had m.p. 223° - 225° C.

Analysis for base C₃₃ H₃₈ FNO₂ : C, 69.25; H, 7.66; N, 2.80 Found: C, 79.18; H, 7.64; N, 2.77

EXAMPLE 23 .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1,2-Dimethylbutyl)-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1,2-dimethylbutyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

The compound of Example 22 was hydrogenated as described in Example 6 and alkylated with propargyl bromide as described in Example 7. The desired product had m.p. 174° - 177° C.

Analysis Calcd. for C₂₉ H₃₄ FNO₂ : C, 77.85; H, 7.66; N, 3.13 Found: C, 77.94; H, 7.89; N, 3.12

EXAMPLE 24 2-(3,5-Dimethoxyphenyl)-3-Methyl-6-(4-Fluorophenyl)Hexane

3,5-Dimethoxy propiophenone, 3(4-fluorophenyl)-propyl bromide and methyl magnesium bromide were used to prepare the desired compound as described in Example 20. The product had b.p. 170 - 180/0.5mm. Gas chromatography showed 2 isomers in a 62/38 ratio.

EXAMPLE 25 .[.2-Benzyl-8-(5-p-Fluorophenyl-1,2-Dimethylpentyl)-10-Hydroxy-5-Oxo-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol of Hydrochloride.]. .Iadd.2-Benzyl-8-[5-(p-fluorophenyl)-1,2-dimethylpentyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 24 was converted to the resorcinol by the method described in Example 3 and the resulting resorcinol converted to the desired compound by the method of Example 4. The product had m.p. 222° - 224° C.

EXAMPLE 26 .[.2-Benzyl-5,5-Dimethyl-8-(5-p-Fluorophenyl-1,2-Dimethylpentyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol Hydrochloride.]. .Iadd.2-Benzyl-5,5-dimethyl-8-[5-(p-fluorophenyl)-1,2-dimethylpentyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride .Iaddend.

The compound of Example 25 was converted to the desired compound by the method of Example 5. The base was converted to the hydrochloride by HCl in ethanol. The product had m.p. 217° - 218° C.

Analysis Calcd. for C₃₄ H₄₁ ClFNO₂ : C, 74.22; H, 7.51; N, 2.54 Found: C, 73.69; H, 7.44; N, 2.55

EXAMPLE 27 .[.5,5-Dimethyl-8-(5-p-Fluorophenyl-1,2-Dimethylpentyl)-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[5-(p-fluorophenyl)-1,2-dimethylpentyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

The compound of Example 26 was hydrogenated as described in Example 6 and alkylated with propargyl bromide as described in Example 7. The desired product had m.p. 155° - 156° C.

Analysis Calcd. for C₃₀ H₃₆ FNO₂ : C, 78.05; H, 7.86; N, 3.03 Found: C, 78.19; H, 8.00; N, 3.04

EXAMPLE 28 .[.5,5-Dimethyl-8-[4(4-Chloro-3-Trifluoromethylphenyl)-1-Methylbutyl]-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.8-[4-(4-Chloro-3-trifluoromethylphenyl)-1-methylbutyl]-5,5-dimethyl-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin

4-Chloro-3-trifluoromethyl aniline was converted to the diazonium salt with sodium nitrite and sulfuric acid and this was reacted with acrylic acid (Meerwein reaction) to give 4-chloro-3-trifluoromethyl cinnamic acid. This acid was hydrogenated, reduced with lithium aluminum hydride to the alcohol and reacted with phosphorus tribromide to give 3(4-chloro-3-trifluoromethylphenyl)propyl bromide.

The above bromide was converted to 2(3,5-dihydroxyphenyl)-5-(4-chloro-3-trifluoromethylphenyl)pentane by the method described in Examples 2 and 3, and this in turn was converted into the final product by reaction with 1-benzyl-3-keto-4-carbethoxy piperidine as described in Example 4 followed by methyl magnesium bromide (as in Example 5), hydrogen (as in Example 6) and propargyl bromide (as in Example 7).

EXAMPLE 29 .[.5,5-Dimethyl-8-[4(2-Chloro-4-Methylphenyl)-1-Methylbutyl]-10-Hydroxy-2-(2-Propynyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.8-[4-(2-Chloro-4-methylphenyl)-1-methylbutyl]-5,5-dimethyl-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

Starting with 2-chloro-4-methylaniline the reaction sequence of Example 28 was followed yielding the desired product.

EXAMPLE 30 .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-10-Hydroxy-2-(3-Methyl-2-Butenyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-(3-methyl-2-butenyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

.[.5,5-Dimethyl-8-(4-p-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.(1 mole) and 1-bromo-3-methylbutene-2 (0.5 mole) were reacted in dimethyl formamide as described in Example 7 to give the desired product.

EXAMPLE 31 .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-10-Hydroxy-2-(3-Chloro-2-Propenyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-(3-chloro-2-propenyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

.[.5,5-Dimethyl-8-(4-p-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend. (1 mole) and 1,3-dichloro-2-butene (0.5 mole) were reacted in dimethylformamide as described in Example 7 to give the desired product.

EXAMPLE 32 .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-10-Hydroxy-2-(Cyclopropylmethyl)-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-cyclopropylmethyl-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

.[.5,5-Dimethyl-8-(4-p-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.(1 mole) and cyclopropylmethylbromide were reacted in dimethylformamide as described in Example 7 to give the desired product.

EXAMPLE 33 .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-2-Propyl-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-2-propyl-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

5,5-Dimethyl-8-(4-p-fluorophenyl-1-methylbutyl)-2-(2-propynyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.was hydrogenated in ethanol using 5% palladium on carbon as a catalyst. When two equivalents of hydrogen were taken up, the catalyst was filtered and solution concentrated to give the desired product.

EXAMPLE 34

.[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-2-[3(3,4,5-Trimethoxyphenyl)-2-Propenyl]-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]Benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-2-[3-(3,4,5-trimethoxyphenyl)-2-propenyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

.[.5,5-Dimethyl-8-(4-p-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.(1 mole) and 1-(3-chloropropenyl)3,4,5-trimethoxybenzene and (0.5 mole) were reacted in dimethylformamide as described in Example 7 to give the desired product.

EXAMPLE 35 .[.5,5-Dimethyl-8-(4-p-Fluorophenyl-1-Methylbutyl)-2-(Cyclobutanecarbonyl)-10-Hydroxy-1,2,3,4-Tetrahydro-5H[1]benzopyrano[4,3-c]Pyridin-10-ol.]. .Iadd.2-Cyclobutanecarbonyl-5,5-dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.

.[.5,5-Dimethyl-8-(4-p-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol.]. .Iadd.5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine .Iaddend.(1 mole) and cyclobutanecarbonyl chloride (1 mole) with triethylamine (1 mole) in dimethylformamide, stirring 16 hours at 25° C gave the desired product. 

I claim:
 1. A compound of the formula ##STR4## where R₁ is hydrogen, loweralkyl, 3-methyl-2-butenyl, .Iadd.propargyl, .Iaddend.3-chloro-2-propenyl, cyclopropylmethyl, phenylloweralkyl, or 3(3,4,5-trimethoxyphenyl)-2-propenyl; R₂ is methyl; R₃ is hydrogen; .[.Y is a radical of the formula ##STR5## where n is a linear chain of 1-9 carbon atoms and R₇ is H or CH₃ ;.Iadd.y is a straight or branched chain alkylene group having 4 to 7 carbon atoms and having no branch larger than a methyl group; .Iaddend.and each R₄ and R₅ and R₆ are the same or different members of the group consisting of hydrogen, halo, trifluoromethyl or loweralkyl; and the pharmaceutically acceptable salts thereof.
 2. A compound in accordance with claim 1 wherein R₁ is benzyl.
 3. A compound in accordance with claim 1 wherein R₁ is hydrogen.
 4. A compound in accordance with claim 1 wherein R₁ is propargyl .[.and each R₂ is methyl.]..
 5. A compound in accordance with claim 1 of the formula ##STR6## where R₁ is hydrogen, loweralkyl, 3-methyl-2-butenyl, .Iadd.2-propynyl, .Iaddend.3-chloro-2-propenyl, cyclopropylmethyl, phenylloweralkyl, or 3(3,4,5-trimethoxyphenyl)-2-propenyl; R₂ is methyl, Y is a radical of the formula .[. ##STR7##.]..[.where n is a linear chain of 1-9 carbon atoms and R₇ is H or CH₃. ##STR8## .Iadd.where n is an integer from 1 to 3 inclusive, R₇ is hydrogen or methyl and R₈ is hydrogen or methyl except that R₈ cannot be methyl if R₇ is hydrogen. .Iaddend. .[.
 6. A compound in accordance with claim 5, 2-benzyl-5,5-dimethyl-3-(4-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol..]. .[.7. A compound in accordance with claim 5, 5,5-dimethyl-3-(4-fluorophenyl-1-methylbutyl)-10-hydroxy-1,2,3,4-tetrahydr o-5H[1]benzopyrano[4,3-c]pyridin-10-ol hydrochloride..]. .[.8. A compound in accordance with claim 5, 5,5-dimethyl-3-(4-fluorophenyl-1-methylbutyl)-10-hydroxy-2-[2-propynyl)]-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridin-10-ol..]..Iadd.
 9. 2-Benzyl-5,5-dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine. .Iaddend..Iadd.
 10. 5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine hydrochloride. .Iaddend..Iadd.
 11. 5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine. .Iaddend..Iadd.
 12. A compound of the formula ##STR9## wherein R₁ is hydrogen, C₁ -C₆ alkyl, C₂ -C₆ alkenyl, C₂ - C₆ alkynyl, halo(C₂ -C₆)alkenyl, halo (C₂ -C₆) alkynyl or phenyl (C₁ -C₆) alkyl; Y is a straight or branched chain alkylene group having from 4 to 7 carbon atoms and having no branch larger than a methyl group; and each R₄ and R₅ and R₆ are the same or different members of the group consisting of hydrogen, halo, trifluoromethyl or loweralkyl. .Iaddend..Iadd.
 13. A compound in accordance with claim 12 of the formula ##STR10## wherein Y is a radical of the formula ##STR11## where n is an integer from 1 to 3 inclusive, R₇ is hydrogen or methyl and R₈ is hydrogen or methyl except that R₈ cannot be methyl when R₇ is hydrogen. .Iaddend..Iadd.
 14. A compound in accordance with claim 13, 2-Benzyl-8[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine. .Iaddend..Iadd.
 15. A compound in accordance with claim 13, 8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-5-oxo-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine. .Iadd.
 16. A pharmaceutical composition in unit dosage form comprising an analgesic effective amount of a compound of claim 1 and a pharmaceutically acceptable carrier or diluent. .Iaddend..Iadd.
 17. A pharmaceutical composition in accordance with claim 16 wherein said compound is 5,5-Dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl] -10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine. .Iaddend..Iadd.
 18. A method of relieving pain comprising administering a therapeutically effective amount of a compound of claim 1 to a patient in need of such treatment. .Iaddend..Iadd.
 19. The method of claim 18 wherein the compound is 5,5-dimethyl-8-[4-(p-fluorophenyl)-1-methylbutyl]-10-hydroxy-2-(2-propynyl)-1,2,3,4-tetrahydro-5H[1]benzopyrano[4,3-c]pyridine. .Iaddend. 